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/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.sun.gluegen.runtime;
import java.nio.*;
public class StructAccessor {
private ByteBuffer bb;
private CharBuffer cb;
private DoubleBuffer db;
private FloatBuffer fb;
private IntBuffer ib;
private LongBuffer lb;
private ShortBuffer sb;
public StructAccessor(ByteBuffer bb) {
// Setting of byte order is concession to native code which needs
// to instantiate these
this.bb = bb.order(ByteOrder.nativeOrder());
}
public ByteBuffer getBuffer() {
return bb;
}
/** Return a slice of the current ByteBuffer starting at the
specified byte offset and extending the specified number of
bytes. Note that this method is not thread-safe with respect to
the other methods in this class. */
public ByteBuffer slice(int byteOffset, int byteLength) {
bb.position(byteOffset);
bb.limit(byteOffset + byteLength);
ByteBuffer newBuf = bb.slice();
bb.position(0);
bb.limit(bb.capacity());
return newBuf;
}
/** Retrieves the byte at the specified slot (byte offset). */
public byte getByteAt(int slot) {
return bb.get(slot);
}
/** Puts a byte at the specified slot (byte offset). */
public void setByteAt(int slot, byte v) {
bb.put(slot, v);
}
/** Retrieves the char at the specified slot (2-byte offset). */
public char getCharAt(int slot) {
return charBuffer().get(slot);
}
/** Puts a char at the specified slot (2-byte offset). */
public void setCharAt(int slot, char v) {
charBuffer().put(slot, v);
}
/** Retrieves the double at the specified slot (8-byte offset). */
public double getDoubleAt(int slot) {
return doubleBuffer().get(slot);
}
/** Puts a double at the specified slot (8-byte offset). */
public void setDoubleAt(int slot, double v) {
doubleBuffer().put(slot, v);
}
/** Retrieves the float at the specified slot (4-byte offset). */
public float getFloatAt(int slot) {
return floatBuffer().get(slot);
}
/** Puts a float at the specified slot (4-byte offset). */
public void setFloatAt(int slot, float v) {
floatBuffer().put(slot, v);
}
/** Retrieves the int at the specified slot (4-byte offset). */
public int getIntAt(int slot) {
return intBuffer().get(slot);
}
/** Puts a int at the specified slot (4-byte offset). */
public void setIntAt(int slot, int v) {
intBuffer().put(slot, v);
}
/** Retrieves the long at the specified slot (8-byte offset). */
public long getLongAt(int slot) {
return longBuffer().get(slot);
}
/** Puts a long at the specified slot (8-byte offset). */
public void setLongAt(int slot, long v) {
longBuffer().put(slot, v);
}
/** Retrieves the short at the specified slot (2-byte offset). */
public short getShortAt(int slot) {
return shortBuffer().get(slot);
}
/** Puts a short at the specified slot (2-byte offset). */
public void setShortAt(int slot, short v) {
shortBuffer().put(slot, v);
}
//----------------------------------------------------------------------
// Internals only below this point
//
private CharBuffer charBuffer() {
if (cb == null) {
cb = bb.asCharBuffer();
}
return cb;
}
private DoubleBuffer doubleBuffer() {
if (db == null) {
db = bb.asDoubleBuffer();
}
return db;
}
private FloatBuffer floatBuffer() {
if (fb == null) {
fb = bb.asFloatBuffer();
}
return fb;
}
private IntBuffer intBuffer() {
if (ib == null) {
ib = bb.asIntBuffer();
}
return ib;
}
private LongBuffer longBuffer() {
if (lb == null) {
lb = bb.asLongBuffer();
}
return lb;
}
private ShortBuffer shortBuffer() {
if (sb == null) {
sb = bb.asShortBuffer();
}
return sb;
}
}
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